import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class test1 {
    public static void main(String[] args) throws ParseException {
        String dateStr = "2021/09/07";
        SimpleDateFormat df1 = new SimpleDateFormat("yyyy/MM/dd");
        Date date = df1.parse(dateStr);

        SimpleDateFormat df2 = new SimpleDateFormat("yyyy年MM月dd日 E");
        String retDateStr = df2.format(date);
        System.out.println(retDateStr);

    }
}
